Leaked Capacitors Caused Dim Display And ‘Low Battery’ Indication In PEAK ATLAS DCA55
This is my handy tool and when it showed ‘low battery’, I opened it for replacement and found that the battery had leaked and corroded the contacts. This was a few months back. I had cleaned the board thoroughly and connected it to a 12V adapter to avoid repetition of such battery leakages. It was working very well until now, when it started showing same error, added to it was the dim display.
First I checked and ensured that the adaptor was ok and delivering 12V. Then opened the unit and found to my dismay that two of the aluminium 22uF/35V caps had leaked and corroded! Perhaps the aftermath of the leaked battery! By gently shaking the caps on to its sides using a nose plier, without pulling, and holding it tightly to its base, as described by me in my previous articles, I removed both.
Cleaned the board thoroughly and replaced the caps using a regular one and making it seat snugly. I had to use a 43 SWG copper wire to link a track, which had got corroded. My recently acquired microscope came very handy again.
Then when I applied power, the DIM display was still there, though the ‘Low battery’ error had gone. On inspection I found a lot of dry solder. So, I applied liquid flux on all the components, and retouched all with fresh solder.
Then cleaned the board thoroughly using IPA, taking care not to spoil the LCD display. I repeated it until the board was as clean as it could be. Then, when I applied power, the display was as good as it was new! Mission accomplished with double satisfaction getting added to its collection bag!
This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous repair article below: